Oscillation-responsive device.



No. 867,876. PATENTED OCT. 8, 1907. L. DE FOREST.

OSCILLATION RESPONSIVE DEVICE.

APPLICATION FILED APR. 4, 1906.

\X/ITHESEEE: NEH-rm 54.4% /u 216. M; @M'WM LEE DE BIOREST, OF NEW YORK, N.

Y.,r lSSIGN t AssAcHUsE'r'rs;

on To GEORGE wooowon'rn, 0F sos'rou.

" 'JosornLanoN-nnsr'onswn nnvron.

Specification of Patent.

Patented Oct. 8, i907.

Original application filed m 2, .1905, s an no. 243,018. Divided and this application flied April 4. 1906.

D Serial ll'o- 800.762.

To all whom it'may concern:

Be it known-that I, Lnn Dill FOREST, a citizen of the United States, and a resident of New York, in'the county of New York and Stateof New York, have inventeda new and useful. Improvement in Qscillation- Respensive'Devices, oi whichthe following is a specification'. i

- My invention relates to an improvement in the sensitive member used in systems of wireless telegraphy to detect electrical waves or oscillations and comprises the novel features hereinafter shown and described and particularly pointed out in the claims.

' In the accompanying drawing I have shown, and in the description thereof will point out, one form of cone invention.

struction which may be employed in carrying out my The figure represents a receiving set for a wirelesstelegraph system, having a sensitive member embodying the principles of my invention.

In the figure, A is an antenna or receiving conductor; or wave intercepting means; E, the earth connection; F, the electrodes of the oscillation responsive device, shown in the present case as included in series with the antenna and earth connection; G, a source of current, such as a dynamo; and T, the receiving or indicating instrument, which-is herein'shown as a telephone receiver, the same being shown only as typical of any form indicating apparatus capable of being employed for such purpose- I as electrodes or conductive members be electrically separated, the separation between them may be neu-' tralized sufficiently to enable them to act as a detector of electrical oscillations, if the intervening or surrounding gaseous medium be put into a condition of molecular and ionic activity, such; Zion instance, as would be caused by heating it in any manner, as by radiation, conduction or by the combustion of gases in the space which surrounds the electrodes. Such condition of molecular and ionic'activity causes what would other-,

namo G and by their radiation heat the-gas between them. This gas may be air or the electrodes may be" inclosed and surrounded by any suitable gas asshown,

H being a-receptacle inclosing said electrodes. The influence of the oscillations upon the gaseous I have discovered that if two'bodies adapted for use i medium intervening between the electrodesF, which medium is maintained in a condition of molecular and ionic activity by the electrical means described, seems to vary the insulating quality of the gapso that while the influenceof the oscillations lasts, the current of the local circuit is varied, thus affecting the indicating device T therein to produce a signal. This may be due to ionization of the gas intervening between the electrodes, which greatly increases the conductivity of said .gas, said. ionization being accomplished in the present instance by putting said gas in a condition of intense molecular activity.

This application isadivision of my application Serial No. 243,913 filed February 2, 1905.

I claim 1. An oscillation responsive device comprising a recep therewlth and responsive to alterations in the conduc' V tlvlty thereof.

2. An oscillation responsive device comprising a receptacle lncloslng a sensitive gaseous conducting medium, electrical means for heating sald gaseous medium, means for lmpresslngelectrlcal oscillations upon said medium, and means operatlvely connected therewith and responsive to alterations in the conductivity thereof.

3. An oscillation responsive device, comprising a receptacle lnclosln'g a gas, electrical meansfior rendering said gas sensitive to electrical oscillations, means for impresslng electrical oscillations upon said gas and means operatlvely connected therewith and responsive to alterations in the conductivity thereof.

4. An oscillation responsive device comprising a receptacle lncloslng a gas, electrical means for putting said gas ln a condition of molecular and ionic activity, means for impressing electrical oscillations upon said gas and means tl'ons upon said medium, and means operatlvely connected operatlvely connected therewith and responsive to alteratlnns In the conductivity thereof.

tacle lnclosing a gaseous medium, means for rendering said gaseousmedlum sensitive to electrlcal osclllatlons and electrlcal oscillations upon said latlon responsive device,- and means for impressing electrlcal oscillations upon sald gaseous medium.

.7. An oscillation. responsive device comprising a receptacle incloslng agaseous medlum, .electrlcal 'means for heating said medlumand means "for impressing electrical oscillations upon said gaseous medium.

8.'An'osclllatlon. responsive device comprising -a recep- I tacle lncloslng-a gaseous medium, electrical means for rendering sa'ld'medlum sensitive to electrical oscillations and means for impressing electrical oscillations upon said gaseous medium.

9.- An osclllatlon responslvedevlce comprising an inclosed partially conducting gaseous medium, means for rendering said gaseous medium sensitive to electrical oscillations and means for impressing electrical oscillations upon said gaseous medium.

10. An oscillation responsive device comprising an inclosed partially conducting gaseous medium, means for increasing the conductivity of said gaseous medium to such an extent as to render the same sensitive to electrical oscillations and means for impressing electrical oscillations upon said gaseous medium.

11. A self-restoring, constantly-receptive oscillation responslve device. comprising in its construction a sensitive conducting gaseous medium inclosed in a receptacle and means for impressing electrical oscillations upon said gaseous medium.

12. An oscillation responsive device comprising a gaseous medium. electrical means for putting said medium in acondition of molecular and ionic activity and means for im pressing electrical oscillations upon said gaseous medium. 13. An oscillation res'ponsive device comprising a gaseous medium, electrical means for rendering said medium sensitive' to electrical oscillations and meansfoi' impressing electrical oscillations upon said gaseous medium.

14. An oscillation responsive device comprising a gaseous medium, electrical means for'heating the same and means for impressing electrical oscillations upon said gaseous medium. l

15. An oscillation responsive device comprising a gaseous medium, electrical means for increasing the electrical conlductivity of said medium and means for impressing electrical oscillations upon'said gaseous medium.

tioned and arranged as to render the gaseous medium inoscillations and means for impressing electrical oscillations upon said gaseous medium.

18. An oscillation responsive device comprisingn reccptacle, two separated electrodes inclosed within said receptacle, electrical means whereby the gaseous medium intervening between said electrodes is maintained in a condition of molecular and ionic activity and means for impressing electrical oscillations upon saidgaseous medium.

19. An oscillation responsive device comprising a rcccptacle inclosing a gaseous medium, electrical means for putting said medium in a condition of molecular and ionic activity and means for impressing electrical oscillations upon said gaseous medium.

In testimony whereof, I have hereunto subscribed my name this 5" day of March 1906.

FRANCIS W. Fnioou'r, I H. D. JAMESON. 

